Miguel Castillo

US Patent:

51712326, Dec 15, 1992

Filed:

Jul 12, 1991

Appl. No.:

7/729372

Inventors:

Miguel A. Castillo - Hialeah FL
Javier E. Castaneda - Miami FL
Eric Glemser - Miami FL

Assignee:

Cordis Corporation - Miami Lakes FL

International Classification:

A61M 2500

US Classification:

604280

Abstract:

A flexible plastic catheter defines a flexible, distal tip. In accordance with this invention, the distal tip comprises a plastic formulation containing sufficient radiopaque agent to be substantially more radiopaque and preferably softer than portions of the catheter proximal to the tip. Thus, the distal tip area of the catheter can be flexible to avoid possible tissue damage as the catheter is advanced, but is still readily visible by x-ray. At the same time, the majority of the catheter may be of normal flexibility and strength.

US Patent:

50450727, Sep 3, 1991

Filed:

Jun 13, 1989

Appl. No.:

7/365477

Inventors:

Miguel A. Castillo - Hialeah FL
Javier E. Castaneda - Miami FL
Eric Glemser - Miami FL

Assignee:

Cordis Corporation - Miami Lakes FL

International Classification:

A61M 2500

US Classification:

604280

Abstract:

A flexible plastic catheter defines a flexible, distal tip. In accordance with this invention, the distal tip comprises a plastic formulation containing sufficient radiopaque agent to be substantially more radiopaque and preferably softer than portions of the catheter proximal to the tip. Thus, the distal tip area of the catheter can be flexible to avoid possible tissue damage as the catheter is advanced, but is still readily visible by x-ray. At the same time, the majority of the catheter may be of normal flexibility and strength.

US Patent:

60778806, Jun 20, 2000

Filed:

Jul 22, 1998

Appl. No.:

9/120414

Inventors:

Miguel Castillo - Hialeah FL
Joquin Villalobos - Miami FL
Jeffrey Walker - Fort Lauderdale FL

Assignee:

Cordis Corporation - Miami FL

International Classification:

C08J 704
A61L 2918
A61L 2908

US Classification:

523105

Abstract:

In accordance with the present invention there is provided a method for making a highly radiopaque polyolefin compound, wherein the radiopaque material in said compound is substantially uniformly dispersed and held within a polymer matrix. During the method one first heats an amount of polyolefin, preferably low density polyethylene, to at least its melting temperature. The amount of polyolefin is equal to at least 10% by weight of the compound. Then an amount of radiopaque metal powder is added to the polyolefin. The amount of radiopaque metal is equal to up to 90% by weight of the compound. The metal powder is preferably tantalum, tungsten, gold or platinum. Thereafter, an amount of a dispersing agent is added to the polyolefin to form a mixture. The amount of dispersing agent is equal to at least 0. 2% by weight of the compound.